Heel nailing machine with nail feed



Jan. 7, 1936. J. SANDT HEEL NAILING MACHINE WITH NAIL FEED Filed Dec. 22 1934 4 Sheets-Sheet l Jan. 7, 1936. J. SANDT HEEL NAILING MACHINE WITH NAIL FEED Filed Dec. 22, 1934 4 Sheets-Sheet 2 Jan. 7, 1936. J. SANDT HEEL NAILING MACHINE WITH NAIL FEED 4 Sheets-Sheet 3 Filed Dec.

6' Saudi Jan. 7, 1936. J. SANDT 2,027,122

HEEL NAILING MACHINE WITH NAIL FEED Filed Dec. 22, 1934 4 Shets$heet 4 Zara/L821? @225 has awaoi' v A/fy.

Patented Jan. 7,. 1936 PATENT OFFICE HEEL NAILING MACHINE WITH NAIL FEED Julius Sandt, Pirmasens, Germany Application December 22, 1934, Serial No. 758,805 In Germany December 18, 1933 g 9 Glaiins. In heel nailing machines the nails are generally introduced into the nail blockor shoe sup- "to produce the movement of the nail feeder fromthe. machine drive due to the engagement of a coupling. This however brings the danger with it that the forwardly moving nail feeder meets the piece of work which is still in its track, or the hand of the operator, and the nail head and thus causes injury to the operator and.

damage to the piece of work in the machine. To avoid these defects, in the construction according to the invention for a heel nailing machine with rising and falling nail block the nail block is'so arranged that at the end of the cycle of work it is lowered so far under a hand rest that a nail feeder can be moved into the nail delivery position betweenthe nail block and the hand rest, whereby after the return of the nail feeder into the position in which it takes up nails, the nail block returns into a position above the hand rest in which a new piece of work can be put upon it. In this way it is attained thatthe charging of the nail block .takes place well separated by the hand rest from the manipulation of the piece of work so that an undesired collision of the nail feeder with the hand of the operator, the piece of work and the shoe support is avoided completely. The hand rest can be easily so formed and arranged that it closely encompasses in a somewhat U-shape the shoe support in its nailing position so as to effect or facilitate the stripping off of the finished piece of work when the shoe support sinks, and to make it impossible to put on a piece of work as long as the shoe support is below the hand rest. In order to ensure an unobjectiorb able working of the machine with the simplest operation, it is preferable that the reciprocal movements of the nail block, the nail feeder and the counter pressure stamp should be actuated dependent upon the movement and automat .ically from the drive of the machine by hydrau lic operation through several pistons which are put under pressure one after the other by a common change-over mechanism. Such a changeover mechanism may consist of a pedal which corresponding to its various positions enables the individual working parts of the machine to be actuated in the necessary sequence.

The object of the invention in an exemplary construction is illustrated in the appended drawings which show: 5

Figure 1 is a view in elevation, partly in section, of the improved heel nailing machine, the parts being shown in their initial positions.

Figure 2 is a similar view, the parts being shown in the heel locating position.

Figure 3 is a similar view with the parts shown in a position to permit the arrangement of the nail feeder for subsequent nailing operation.

Figure 4 is a plan of a detail showing the relation of the hand restto the nail pillar.

Figure 5 isfla side elevation, partly in section, of'the same, the nail feeder being shown in operative position. I g

In the machine stand I, the nail pillar 2 and the plunger 3 are movably arranged vertically 2 opposite each other in special guides. The plunger 3 possesses a piston 3" which can be moved upwards or downwards by hydraulic pressure means conducted in the leads 39 and38. A

spring 8 is constrained to hold the plunger 3 in 25 the upper position. The nail pillar 2 is carried by a casing 21 which with the object of adjustment, is arranged in a sliding guide 28 so as to be movable by means of the positioning spindle 29. The sliding guide 28 sits on the piston I. A 30 spring 4| is constrained to hold the piston I with the nail pillar 2 in the upper position. The piston 1 can be lowered or raised by means of a pressure medium led to both sides of the piston 1 by the leads 39 and 40. The guiding of the 35 nail pillar 2 is of such a kind that it is in the upper end position during the nailing and in the lower end position during the introduction of the nails. The end positions of the nail pillar 2 are so fixed by automatically operated locking wedges 5 and! that on the one hand a collision with the likewise automatically operated nail feeder 6 cannot take place (Figure 3), and on the other hand, the nail pillar 2 during the pressure stroke ofthe plunger 3 cannot recede downwards (Figure 2). The locking wedges 4 and 5 and the nail feeder 6 are provided with pistons 4', 5', 6' in order that they may be likewise hydraulically moved. Even the nail driver could be hydraulically driven. However, in the exemplary construction, a purely mechanical drive for this has been chosen, which is taken by the toothed wheels I0 and I I from the drive of the gear pump [2 which maintains the pressure medium in continuous circulation. The spur 5 wheel I is arranged on the nail shaft 9 so that it can be coupled thereto. By a. small downward movement of the draw bolt I3 against the relatively strong spring 64, it can be made to describe one revolution in the direction of the arrow X. The coupling itself is universally known and needs no description.

On the shaft 9 there is a crank disc I which is provided with a cam I5 and crank pin I5. The driving in of the attachment means is done by means of the crank pin I5". This moves the connecting link 24 downwards during the first half rotation of the shaft 9. The connecting link is pivoted to one end of a'two armed lever 25 and moves the end of the lever on the driving side upwards; due to this the driver, which is arranged in the interior of nail pillar 2 in a known way, is also moved upwards, so that the attachment means are driven into the piece of work 26. During the second half rotation of the shaft 9 the spring arranged in the nail pillar 2 draws back the driver in a known way, so that the lever 25 returns to its initial position. After nailing the cam I5 breaks the connection between the catch links I6, IT by means of the push rod I8. Due to this the upward movement of aratchet 20 is caused by the influence 01' a tensioned pull spring I9, which throws the ratchet disc 2| one ratchet space round in the direction of the arrow Y. The ratchet disc 2| is attached to a shaft 22, which is coupled to the change-over valve 23 and at the moment of the switching over reverses the direction of the oil flow. In the rest position the cam I5 again clears the push rod I8.

The ratchet disc 2| is worked not only by the ratchet 20 but also by ratchet 63 which, as described later, is moved through the rods 62, BI, 51 and 36 by the compression spring 60 so that the lever 51 swings out about'the pin 58 which at this moment is immovable. This lever is rigidly connected with the pedal 43 and has no fixed pivot point. If the draw bolt I3, which has already been mentioned, and which is carried by the strong spring 64, is in engagement with latch It which is pivoted at 58 to the lever 51, then the pin 58 forms the pivot point for the lever 51, when the pedal 43 is pressed downwards. If, on the other hand, the latch I4 is out of engagement with the rod I3 then the spring 60 presses the lever 51 down at its right end so that the movement of the ratchet disc 2| proceeds. The left end of the lever 51 is carried by a spring 56 which engages the cranked arm I4 of the latch I4.

The lower part of the machine body is formed as an oil sump and carries directly above this the oil propulsion and control organs. The pressure fluid rises under vacuum through the suction lead 34 into the pump I2 and from here is led out first through a nonreturn valve 3|! to an annulus 35. If, as a result-of the spring 69 the piston 35 is in the lower position as in Figure 1, then the fluid returns via the leads 3'! and 32 straight to the oil sump. If, on the other hand, the piston 36 due to the swinging out of the pedal 43 about the pin 58 is raised into a position as in Figure 2, then the fluid reaches the rising'leads 38 or 39, Figures 2 and 3, according vto the position of the change-over valve 23. In

the position of the parts shown in Figure 2 the rising lead 38 is under pressure. By this pressure the piston 5 of the catch '5 and the piston I5 of the feeder 6 are held in their backward position, while the piston 3 moves contrary to the tension spring 8 and the plunger 3 approaches the heel 26' of the shoe 25. In the end position of the plunger 6 the lead 20 is left free so that the pressure fluid can come under the piston rod I. 5

Now as the weight of the piston I together with the parts 24 to 29 of the nail pillar 2 are lifted up easily by means of the spring ll the piston 'I has already taken up the upper rest position beforehand, that is to say before the plunger 3 has reached its lowermost position. The springs 8 and 4| are so chosen in relation to one another that before the pressure fluid overcomes the spring 8 the piston 55 is returned and thus the piston surface I of the piston I receives pressure so that in any case the piston 1 reaches the upper rest position and is then held fast hydraulically in this position. At the same time the piston 4 of the locking wedge 4 likewise receives pressure and keeps on endeavouring with its front end to lock the guide way until it succeeds. Only then does the plunger 3 sink down on to the piece of work after it has overcome the spring 8 which was previously tensioned. 7

Due to further movement of the pedal 43 the shaft 9 as described above is coupled to describe one rotation. The nail pressure resulting from this propagates itself in the manner of a blow through the leads 38 and #9 which are under 30 pressure and is intercepted by the non-return valve 3|) which protects the gear pump at the moment of nailing against back pressure. During the overload the pressure regulating valve 3| opens so that the remaining part of the pres sure fluid can flow away through the return leads 32 which is under low pressure. This condition is only an instantaneous phenomenon, because immediately afterwards the oil stream is reversed. It is much desired as end pressure the tension spring 8, because as intended the resistance is least here. Then the piston 4' follows positively and in the last place the piston 1 after overcoming the compression spring 4|. The hydraulic return of the pistons 3 and 'I is of special importance in the interest of a quick and sure return stroke.

Shortly before the low position of the piston I is reached, the lead 44 also receives pressure and thus the piston 5. As long as the low position which the piston 'I is attempting to reach has not been completely taken up, the locking part 5 cannot move forward and the lead 45 rising to the feeder piston 6' is not put under pressure. With this object a non-return valve 46 is provided in the base of the piston 5' which closes the lateral opening 5" of the piston 5' against a spring 66, but in the reverse position to that shown in Figure 2, it does not hinder the passage of pressure fluid from lead 45 to 44. If the locking part 5 has locked the piston 'I in the low posi- 70.

tion, the piston 6 begins to move forward. After it has moved a certain distance a projection 41 on the piston rod 6 takes a push rod 48 with it and thus via the crank lever 49 moves the catch link I6 downwards. In this r6v In this way the rising lead 38 is 4.5

way the catch link I! which until now has been disengaged due to the actionof the tension spring .l9,is again coupled up. On raising the catch l6 the roller 50 of the rod l8 moves back into the track of thecam l5.

In the meantime the feeder 6 has approached the nail pillar 2 so closely that the shoulder 5| of the feeder plate 5| comes into contactwith the heel end 2' of the nail pillar 2. After this the feeder 6 moves a little further against the action of a spring 52 in a known way until the nail channels of" the parts 6 and' 5| come into agreement with those of the nail pillar 2. The track of the feeder 6 is now covered over from above by a hand protecting plate 53 so that an injury of the hand. grasping the shoe heel and also the piece of work, is thus prevented.

If the nail feeder 6 has taken up its forward end position then the pressure in the lead 39 rises until it overcomes the spring 55 of the piston 54 which dislocates the catch link 14. This forms with M a crank lever supported by the spring 56 and at the same time pressed on the end of the piston shaft 54. It is pivoted to the control lever 51 which can swing about the boss 58 just as it can about the boss 59. At themoment of release of the catch the control lever 51 as a whole moves downwards under the influence of the compression spring 60, and thus on the downfiow side draws the ratchet 63 down- Wards by means of a coupling GI and the guide rod 62.

Thus in the way mentioned the change-over valve 23 again reaches the initial position, Figures 1 and 2. Now in this process however, the control piston 36 has sunk down and has thus freed the way for the oil flow via 31 to the oil sump, so that the working cycle is finished; The piston 54 is again unloaded and returns back towards the right so that on releasing the pedal 43 the connection between I3 and I4 is again made.

If it is desired to start the working cycle and ,to raise the nail pillar 2 the pedal 43 must be pressed down and at first only by a small amount. As a result of this the control lever 51 is turned about the boss 58 and the control piston 36 raised, so that the flow of the pressure oil via 31 can no longer take place. Now the wedge 5 and the nail feeder 6 are drawn back. As soon as the upward movement of the nail pillar 2 begins, the pedal is released and the piston I automatically takes up the upper rest position under the action of the compression spring 4| Figure 1.

The piece of work is introduced in this position of the nail pillar. The pedal 43 can, as long as the spring 64 has not been overcome, be released again and moved downwards in order to repeat the location of the heel by unloading the plunger 3. The overcoming of the spring 64 is noticeable due to the difference in the resistance of the same in relation to the spring 60 and indicates to the operator the beginning of a nailing movement. During the overcoming of the spring 54 the boss 59 becomes the pivot axis of the control lever 51 instead of the .boss 58, so that the ratchet 63 comes into engagement with the appropriate ratchet boss of the ratchet disc 21 due to the action of the tension spring 65.

During the nailing the heel of the shoe is grasped by the left hand so that the ball of the hand lies on the hand rest plate 53. After nailing the plunger 3 is returned and directly afterwards the nail pillar 2. Except for holding the piece of work firmly in the working position,

as already mentioned at the beginning, the operator does not have to worry about removing the latter as to a certain exent the piece of work is freed by the machine itself, since it is stripped from the nail pillar 2 by the hand rest plate 53. 5

In the exemplary construction illustrated the machine is shown working on low shoes, but it can, however, Work on high shoes in the same way. With this object the vertical stroke of the nail pillar 2 is correspondingly increased and 10 the opening in the rest plate 53 is provided with a downwardly cranked extension 53' corresponding to the increase in stroke, in accordance with Figure 5. The opening 53" in the rest plate 53 agrees approximately with the 15 profile of the heel rest plate 2 of the nail pillar 2. Since in general the nail pattern and thus the reduced part alters with the size of the heel rest plate 2; the rest plate 53 is attached to the reduced part 10.

The operation of a machine in accordance with this invention can also follow completely automatically, and the nail head can, instead of pointing vertically downwards as it generally does in the nailing of heels from the inside, be driven laterally or from behind in order to take up the new nails. Such a movement would be easily possible in exterior machines, as also in rubber heel piece and patch nailing machines.

What I claim is:

1. In a heel nailing machine, a fixed hand rest for the hand of the operator in positioning the shoe and heel, a nail pillar, means for raising and lowering the nail pillar relative to the hand rest, a nail feeder designed to be moved to a 86 position immediately above and in contact with the nail pillar, and means foroperating the nail feeder to position the same relative to the nail pillar when the latter is in lowered position, the plane ofmovement of the nail feeder being 4.0 below the hand rest and above the lowered nail pillar.

2. A construction as defined in claim 1, wherein the hand rest is of U-form in plan to permit the nail pillar to move between the legs of the 46 U-form hand rest in the movement of the pillar to the upper operative position.

3. A construction as defined in claim 1, where- I in the hand rest interrupts the work-piece from following the nail pillar in the lowering movement of the latter, whereby to permit complete withdrawal of the nail pillar from the workpiece.

4. A construction as defined in claim 1, including a plunger to cooperate with the workpiece for holding the latter in position during the nailing operation.

5. A construction as defined in claim 1, including hydraulic means for operating the nail pillar and nail feeder in proper sequence. 60

6. In a heel nailing machine, a fixed hand rest, a nail pillar, means for reciprocating the pillar relative to the hand rest from an inoperative position below the hand rest to an operative position above the hand rest, a nail feeder 65 for delivering nails to the nail pillar, and means for operating the nail feeder toward and from the nail pillar when the latter is in a position below the hand rest, the path of movement of the nail feeder being below the hand rest to 70 protect the work-piece and hand of the operator from contact with the nail feeder.

7. A construction as defined in claim 6, wherein the nail block has a piston support, together with hydraulic means cooperating with said ms 75 operating in a conduit, together with hydraulic means for actuating the piston to move the nail feeder intooperative and inoperative relations with respect to the nail pillar.

9. In a heel nailing machine, a hand rest, a nail pillar operating relative to the hand rest, a nail feeder movable into operative cooperation with the nail pillar, a plunger to cooperate with the heel on the shoe in position on the hand rest, pistons connected to the nail pillar, nail feeder and plunger, hydraulic means for operating said pistons in both directions, a control mechanism for such hydraulic means to thereby govern the pistons and the movement of the piston-connected parts, a compression spring to assist the operative movement of the nail pillar, and a tension spring for holding the plunger normally in a position of rest.

JULIUS SANDT. 

